VACUUM SECONDARY COMPONENTS AED ALSO OFFERS AN ADJUSTABLE JET PLATE CONVERSION KIT SO YOU CAN ACTUALLY CHANGE JETS ON THE BACK SIDE OF THE 4160 600 AND THE 3310 750 CFM CARBS. CHOICES: AED 5340 VACUUM SECONDARY DIAPHRAM  $8.75AED 5580 VAC. SECONDARY TUNING KIT  $13.99AED 5585 QUICK CHANGE TUNING KIT VAC. SEC  $20.15AED 6310 METERING BLK. CONV KIT 3310  $44.99AED 6320 ADJUSTABLE JET PLATE CONVERSION KIT 4160  $49.99AED 6330 ADJUSTABLE JET PLATE CONVERSION KIT FOR 3310  $44.99   GO BACK